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<HTML><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><!-- Created on September, 12  2004 by texi2html 1.64 --><!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)            Karl Berry  <karl@freefriends.org>            Olaf Bachmann <obachman@mathematik.uni-kl.de>            and many others.Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>Send bugs and suggestions to <texi2html@mathematik.uni-kl.de> --><HEAD><TITLE>Autoconf, Automake, and Libtool: Extra Macros for Libtool</TITLE><META NAME="description" CONTENT="Autoconf, Automake, and Libtool: Extra Macros for Libtool"><META NAME="keywords" CONTENT="Autoconf, Automake, and Libtool: Extra Macros for Libtool"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META NAME="Generator" CONTENT="texi2html 1.64"><script language="Javascript"><!--    // Check the browser version.    function checkVersion() {      if (navigator.appVersion.charAt(0)>=3) return true; 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<TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_83.html#SEC83" onMouseover="img_act('back')" onMouseout="img_inact('back')"><IMG SRC="back.png" BORDER="0" ALT="FastBack: Using GNU Libtool" ALIGN="MIDDLE" NAME="back"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_84.html#SEC84" onMouseover="img_act('up')" onMouseout="img_inact('up')"><IMG SRC="up.png" BORDER="0" ALT="Up: Integration with configure.in" ALIGN="MIDDLE" NAME="up"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_87.html#SEC87" onMouseover="img_act('forward')" onMouseout="img_inact('forward')"><IMG SRC="forward.png" BORDER="0" ALT="FastForward: Integration with Makefile.am" ALIGN="MIDDLE" NAME="forward"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook.html#SEC_Top" onMouseover="img_act('home')" onMouseout="img_inact('home')"><IMG SRC="home.png" BORDER="0" ALT="Top: Autoconf, Automake, and Libtool" ALIGN="MIDDLE" NAME="home"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_toc.html#SEC_Contents" onMouseover="img_act('toc')" onMouseout="img_inact('toc')"><IMG SRC="toc.png" BORDER="0" ALT="Contents: Table of Contents" ALIGN="MIDDLE" NAME="toc"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_285.html#SEC285" onMouseover="img_act('index')" onMouseout="img_inact('index')"><IMG SRC="index.png" BORDER="0" ALT="Index: Index" ALIGN="MIDDLE" NAME="index"></A></TD></TR><TR VALIGN="TOP" ALIGN="LEFT"><TD VALIGN="MIDDLE" ALIGN="LEFT"><A HREF="autobook_abt.html#SEC_About" onMouseover="img_act('help')" onMouseout="img_inact('help')"><IMG SRC="help.png" BORDER="0" ALT="About: About this document" ALIGN="MIDDLE" NAME="help"></A></TD></TR></TABLE></TD><TD ALIGN="LEFT"><H3> 11.1.2 Extra Macros for Libtool </H3><!--docid::SEC86::--><P>There are several macros which can be added to <TT>`configure.in'</TT> whichwill change the default behaviour of <CODE>libtool</CODE>.  If they areused they must appear before the call to the <SAMP>`AC_PROG_LIBTOOL'</SAMP>macro.  Note that these macros only change the default behaviour, andoptions passed in to <CODE>configure</CODE> on the command line will alwaysoverride the defaults.  The most up to date information about thesemacros is available from the Libtool Manual.</P><P><DL COMPACT><A NAME="IDX15"></A><DT><SAMP>`AC_DISABLE_FAST_INSTALL'</SAMP><DD>This macro tells <CODE>libtool</CODE> that on platforms which requirerelinking at install time, it should build executables so that they canbe run from the build tree at the expense of relinking duringinstallation, as if <SAMP>`--disable-fast-install'</SAMP> had been passed onthe command line.<P><A NAME="IDX16"></A><A NAME="IDX17"></A><DT><SAMP>`AC_DISABLE_SHARED'</SAMP><DD><DT><SAMP>`AC_DISABLE_STATIC'</SAMP><DD>These macros tell <CODE>libtool</CODE> to <EM>not</EM> try and build eithershared or static libraries respectively.  <CODE>libtool</CODE> will alwaystry to build <EM>something</EM> however, so even if you turn off staticlibrary building in <TT>`configure.in'</TT>, building your package for atarget host without shared library support will fallback to buildingstatic archives.</DL><P>The time spent waiting for builds during development can be reduced alittle by including these macros temporarily.  Don't forget to removethem before you release the project though!</P><P>In addition to the macros provided with <SAMP>`AC_PROG_LIBTOOL'</SAMP>, thereare a few shell variables that you may need to set yourself, dependingon the structure of your project:</P><P><DL COMPACT><A NAME="IDX18"></A><DT><SAMP>`LTLIBOBJS'</SAMP><DD>If your project uses the <SAMP>`AC_REPLACE_FUNCS'</SAMP> macro, or any of theother macros which add object names to the <SAMP>`LIBOBJS'</SAMP> variable, youwill also need to provide an equivalent <SAMP>`LTLIBOBJS'</SAMP> definition.  Atthe moment, you must do it manually, but needing to do that isconsidered to be a bug and will fixed in a future release of Autoconf.The manual generation of <SAMP>`LTLIBOBJS'</SAMP> is a simple matter ofreplacing the names of the objects mentioned in <SAMP>`LIBOBJS'</SAMP> withequivalent <CODE>.lo</CODE> suffixed Libtool object names.  The easiest way todo this is to add the following snippet to your <TT>`configure.in'</TT> nearthe end, just before the call to <SAMP>`AC_OUTPUT'</SAMP>.<P><TABLE><tr><td>&nbsp;</td><td class=smallexample><FONT SIZE=-1><pre>Xsed="sed -e s/^X//"LTLIBOBJS=`echo X"$LIBOBJS"|\           [$Xsed -e "s,\.[^.]* ,.lo ,g;s,\.[^.]*$,.lo,"]`AC_SUBST(LTLIBOBJS)</FONT></pre></td></tr></table></P><P>The <CODE>Xsed</CODE> is not usually necessary, though it can prevent problemswith the <CODE>echo</CODE> command in the event that one of the <SAMP>`LIBOBJS'</SAMP>files begins with a <SAMP>`-'</SAMP> character.  It is also a good habit towrite shell code like this, as it will avoid problems in your programs.</P><P><A NAME="IDX19"></A><DT><SAMP>`LTALLOCA'</SAMP><DD>If your project uses the <SAMP>`AC_FUNC_ALLOCA'</SAMP> macro, you will need toprovide a definition of <SAMP>`LTALLOCA'</SAMP> equivalent to the <SAMP>`ALLOCA'</SAMP>value provided by the macro.<P><TABLE><tr><td>&nbsp;</td><td class=smallexample><FONT SIZE=-1><pre>Xsed="sed -e s/^X//"LTALLOCA=`echo X"$ALLOCA"|[$Xsed -e "s,\.$[^.]*,.lo,g"]`AC_SUBST(LTALLOCA)</FONT></pre></td></tr></table></P><P>Obviously you don't need to redefine <CODE>Xsed</CODE> if you already use itfor <SAMP>`LTLIBOBJS'</SAMP> above.</P><P><A NAME="IDX20"></A><DT><SAMP>`LIBTOOL_DEPS'</SAMP><DD>To help you write <CODE>make</CODE> rules for automatic updating of theLibtool configuration files, you can use the value of<SAMP>`LIBTOOL_DEPS'</SAMP> after the call to <SAMP>`AC_PROG_LIBTOOL'</SAMP>:<P><TABLE width=100%><tr><td>&nbsp;</td><td class=example bgcolor=#6688aa><br><pre>AC_PROG_LIBTOOLAC_SUBST(LIBTOOL_DEPS)</pre></td></tr></table></P><P>Then add the following to the top level <TT>`Makefile.in'</TT>:</P><P><TABLE width=100%><tr><td>&nbsp;</td><td class=example bgcolor=#6688aa><br><pre>libtool: @LIBTOOL_DEPS@        cd $(srcdir) &#38;&#38; \          $(SHELL) ./config.status --recheck</pre></td></tr></table></P><P>If you are using <CODE>automake</CODE> in your project, it will generateequivalent rules automatically.  You don't need to use this except incircumstances where you want to use <CODE>libtool</CODE> and<CODE>autoconf</CODE>, but not <CODE>automake</CODE>.</DL><P><A NAME="Integration with Makefile.am"></A></TR></TABLE><BR>  <FONT SIZE="-1">This document was generatedby <I>Gary V. Vaughan</I> on <I>September, 12  2004</I>using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html"><I>texi2html</I></A></BODY></HTML>
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